Fixed-frequency 1-D Fabry-Perot leaky-wave antenna with different radial direction

A one-dimensional (1-D) leaky-wave antenna (LWA) with different radial direction working at 13.2GHz is presented. The antenna was based on Fabry-Perot cavity which composed of a planar partial reflective surface (PRS) and a high impedance surface (HIS). The PRS was made by a printed circuit board which consisted of an array of printed dipoles and the printed circuit´s dimension was modulated to reduce the side lobe level of LWA Meanwhile, the HIS was also fabricated by a printed circuit board which was loaded with capacitors that allow the tuning of reflection phase. The two boards were placed in a parallel-plate waveguide. When the capacitors´ capacitance was varied, the cavity resonance condition was also changed, so that the antenna´s pointing angle would change with capacitance at a fixed frequency. Both the results obtained with HFSS and experimental results of a LWA prototype show that when the capacitance of capacitors is varied, the antenna will have different radial directions.